I had the same problem a few weeks ago and now resolved . try this Baz. Clear your 'Cache & Cookies' and temp. files, log off, unplug all units from the mains A/C supply, ( go and make a cuppa tea !!) reconnect & reboot. That should do the trick
The reason for the short outage today was due to an urgent security update which had to be applied to the server, which was carried out between 11-12 this morning.
The message is through Cloudflare as we use them for additional speed and security, and is basically saying they're OK but the server isn't. You may get the message occasionally, but it's normally only very briefly and a quick refresh should do it. I know this wasn't the case this morning, I think we were out (or very slow) for about 10 mins in total...